engine

Abstract

To provide a technique suitable for downsizing an engine mounted with two cylinder rows.SOLUTION: An engine comprises a first cylinder row and a second cylinder row. The engine also has: a controller which is arranged in a bank area positioned between the first cylinder row and the second cylinder row; and a fuel pipe which is arranged below the controller in the bank area and configures a fuel passage. In a planar view from above or below, a joint section of the fuel pipe is deviated from the controller.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to an engine. [Background technology]

[0002] Conventionally, a known layout for a fuel supply system of a V-type engine having two rows of cylinders is one in which a fuel supply pipe that supplies fuel to an injector is provided within the V-bank space (see, for example, Patent Document 1). Note that in the configuration disclosed in Patent Document 1, a fuel pump used to supply fuel is provided outside the V-bank space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-229942 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, engines used on ships are required to be as compact as possible, such as by minimizing their height, in order to install them in the engine room. Accordingly, it is conceivable to place the fuel supply system, including the fuel pump, and the engine controller that controls the engine in the space inside the V-bank. However, this raises concerns about reduced workability and problems with electrical wiring.

[0005] An object of the present invention is to provide a technique suitable for downsizing an engine having two cylinder rows. [Means for solving the problem]

[0006] An exemplary engine of the present invention is an engine having a first cylinder row and a second cylinder row, the engine including: a controller disposed in an area within a cylinder bank located between the first cylinder row and the second cylinder row; and a fuel pipe disposed below the controller in the area within the cylinder bank and forming a fuel passage. In a plan view from above and below, a joint of the fuel pipe is positioned offset from the controller. [Effects of the Invention]

[0007] According to the exemplary embodiment of the present invention, in an engine having two rows of cylinders, it is possible to reduce the size of the engine while improving the workability of maintenance work, for example. [Brief explanation of the drawings]

[0008] [Figure 1] Schematic perspective view showing the configuration of an engine [Figure 2] FIG. 1 is a schematic perspective view showing a portion of an engine that includes a cylinder block, a head block, and a head cover. [Figure 3] Schematic cross-sectional view of the cylinder block of the engine [Figure 4] Schematic top view showing the engine configuration [Figure 5] FIG. 1 is a schematic perspective view illustrating a fuel system of an engine. [Figure 6] FIG. 1 is a schematic perspective view illustrating an electrical system of an engine. [Figure 7] FIG. 10 is a diagram for explaining the arrangement of electric wires in a guide member; [Figure 8] Schematic cross-sectional view showing the controller and its surroundings [Figure 9] Schematic perspective view showing the configuration of the controller mounting base [Figure 10] An enlarged view of the area between the controller and fuel pump located in the bank area. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, an XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system where appropriate. In the following description, the X direction is the front-rear direction, the Y direction is the left-right direction, and the Z direction is the up-down direction. Note that the +X side is the front side and the -X side is the rear side. The +Y side is the right side and the -Y side is the left side. The +Z side is the up side and the -Z side is the down side. Specifically, the direction in which the center line C of the crankshaft (output shaft) shown in FIG. 1 extends is defined as the front-rear direction, and the side where the flywheel 2 is disposed relative to the cylinder block 1 is defined as the rear side. The up-down direction is defined as the side where the oil pan 3 is disposed relative to the cylinder block 1. The direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction, and the right side when viewed from the rear toward the front is defined as the right side, and the left side is defined as the left side. Note that these directions are names used merely for explanation and are not intended to limit the actual positional relationships and directions.

[0010] <1. Engine Overview> FIG. 1 is a schematic perspective view showing the configuration of an engine 100 according to an embodiment of the present invention. The engine 100 is suitable as a marine engine used in ships, for example. However, the engine 100 is not limited to a marine engine and may be applied to other uses. The engine 100 is a diesel engine.

[0011] As shown in Fig. 1, engine 100 includes a cylinder block 1, a head block 4, and a head cover 5. Fig. 2 is a schematic perspective view showing the portion of engine 100 that includes cylinder block 1, head block 4, and head cover 5. Fig. 3 is a schematic cross-sectional view of the portion of cylinder block 1 that engine 100 includes.

[0012] As shown in Figures 2 and 3, a crankshaft 6 and pistons 7 extending in the front-to-rear direction are arranged inside the cylinder block 1. The interior of the cylinder block 1 is connected to the interior of an oil pan 3 arranged below and storing lubricating oil. A flywheel 2 (see Figure 1) is attached to the rear end of the crankshaft 6. The flywheel 2 rotates integrally with the crankshaft 6 and is used to extract power from the engine 100. More specifically, the pistons 7 are arranged inside cylinders 11 formed in the cylinder block 1. The pistons 7 are connected to the crankshaft 6 via connecting rods 71.

[0013] In detail, the cylinder block 1 has a right cylinder 11R arranged on the right side and a left cylinder 11L arranged on the left side. When viewed from the rear, the right cylinder 11R is cylindrical and extends obliquely, tilting to the right with respect to the vertical direction. When viewed from the rear, the left cylinder 11L is cylindrical and extends obliquely, tilting to the left with respect to the vertical direction. The right cylinder 11R and the left cylinder 11L are arranged in a V-shape. The pair of right cylinder 11R and left cylinder 11L arranged in a V-shape are arranged with their cylinder axes slightly offset in the front-to-rear direction. In this embodiment, the left cylinder 11L is arranged slightly forward of the right cylinder 11R.

[0014] The cylinder block 1 has a right cylinder row 111R in which a plurality of right cylinders 11R are aligned in the front-rear direction, and a left cylinder row 111L in which a plurality of left cylinders 11L are aligned in the front-rear direction. That is, the engine 100 has a first cylinder row 111R and a second cylinder row 111L. The right cylinder row 111R and the left cylinder row 111L form a V-shaped bank. In this embodiment, the number of right cylinders 11R that make up the right cylinder row 111R and the number of left cylinders 11L that make up the left cylinder row 111L are both, for example, six. That is, the engine 100 of this embodiment is a V12 engine.

[0015] In each of the right cylinder row 111R and the left cylinder row 111L, a head block 4 is disposed over each cylinder 11. The head block 4 is fastened to the cylinder block 1 using screws. Specifically, the head block 4 includes a right head block 4R that is disposed over the right cylinder 11R and a left head block 4L that is disposed over the left cylinder 11L. Since one right head block 4R is disposed over each right cylinder 11R, there are the same number of right cylinders 11R. Since one left head block 4L is disposed over each left cylinder 11L, there are the same number of left cylinders 11L. In this embodiment, there are six right head blocks 4R and six left head blocks 4L.

[0016] Each head block 4 has an intake port 41 for supplying gas to a combustion chamber formed by the cylinder 11, piston 7, and head block 4, and an exhaust port (not shown) for exhausting gas from the combustion chamber. The exhaust port is provided on the surface opposite to the surface on which the intake port 41 is provided. Specifically, the right head block 4R has the intake port 41 on its left side surface and an exhaust port on its right side surface. The left head block 4L has the intake port 41 on its right side surface and an exhaust port on its left side surface.

[0017] A head cover 5 is placed on top of each head block 4. The head cover 5 is fastened to the head block 4 using screws. Each head cover 5 covers the intake valves and exhaust valves (not shown) arranged on the head block 4. An injector 8 is attached to each head cover 5. One end of the injector 8, where an injection port for injecting fuel is provided, faces the combustion chamber. The other end of the injector 8 protrudes from the head cover 5 toward the outside.

[0018] In detail, the head cover 5 includes a right head cover 5R that is placed over the right head block 4R and a left head cover 5L that is placed over the left head block 4L. The right head covers 5R are placed over each right head block 4R, so there are the same number of right head covers 5R as there are right head blocks 4R. The left head covers 5L are placed over each left head block 4L, so there are the same number of left head covers 5L as there are left head blocks 4L. In this embodiment, the number of right head covers 5R and left head covers 5L is six. The number of right injectors 8R arranged on the right head cover 5R and the number of left injectors 8L arranged on the left head cover 5L are also six.

[0019] On the right side of the cylinder block 1, the right cylinder 11R, right head block 4R, and right head cover 5R that constitute the right bank RB extend diagonally upward to the right. On the left side of the cylinder block 1, the left cylinder 11L, left head block 4L, and left head cover 5L that constitute the left bank LB extend diagonally upward to the left. In a plan view from the front-to-rear direction, the right bank RB and the left bank LB form a V-shape, and the engine 100 has a V-bank. An intra-bank area 200 is defined between the right bank RB and the left bank LB in the left-to-right direction.

[0020] Returning to FIG. 1, engine 100 includes a top cover 9 and a side cover 10. Top cover 9 prevents water from splashing on a controller 26 (see FIG. 4, etc., described later) and other components disposed inside the engine 100 due to, for example, condensation. Side cover 10 prevents fuel from splashing due to, for example, cracks in components such as head block 4. Although FIG. 1 only shows side cover 10 disposed on the right side, a similar side cover 10 is also disposed on the left side. That is, engine 100 includes a pair of side covers 10, one on each side.

[0021] Fig. 4 is a schematic top view showing the configuration of engine 100 according to an embodiment of the present invention. Top cover 9 and a pair of side covers 10 are omitted in Fig. 4. As shown in Figs. 1 and 4, engine 100 includes an intake manifold 21 and an exhaust manifold 22.

[0022] The intake manifold 21 distributes intake air, which is air or an air-fuel mixture drawn in from the outside, to each cylinder 11. The intake manifold 21 is disposed on top of the engine 100 and extends in the front-to-rear direction. In detail, the intake manifold 21 includes a right intake manifold 21R for the right cylinder 11R and a left intake manifold 21L for the left cylinder 11L.

[0023] The right intake manifold 21R is disposed above the intake ports 41 (see FIG. 2) of the multiple right head blocks 4R aligned in the front-to-rear direction. The interior of the right intake manifold 21R is connected to each right cylinder 11R via each intake port 41. The left intake manifold 21L is disposed above the intake ports 41 of the multiple left head blocks 4L aligned in the front-to-rear direction. The interior of the left intake manifold 21L is connected to each left cylinder 11L via each intake port 41.

[0024] In more detail, an intake valve (not shown) is interposed between each intake port 41 and each cylinder 11, and when the intake valve is open, the inside of the intake manifold 21 and the cylinder 11 communicate with each other.

[0025] The exhaust manifold 22 collects exhaust gases from each cylinder 11. The exhaust manifold 22 is disposed on a side portion of the engine 100 and extends in the front-to-rear direction. In detail, the exhaust manifold 22 includes a right exhaust manifold 22R for the right cylinder 11R and a left exhaust manifold 22L for the left cylinder 11L.

[0026] The right exhaust manifold 22R is disposed on the right side of multiple right head blocks 4R (see FIG. 2) lined up in the front-rear direction. The interior of the right exhaust manifold 22R is connected to each right cylinder 11R via an exhaust port (not shown) provided on the right side of the right head block 4R. The left exhaust manifold 22L is disposed on the left side of multiple left head blocks 4L (see FIG. 2) lined up in the front-rear direction. The interior of the left exhaust manifold 22L is connected to each left cylinder 11L via an exhaust port (not shown) provided on the left side of the left head block 4L.

[0027] In more detail, an exhaust valve (not shown) is interposed between each exhaust port and each cylinder 11, and when the exhaust valve is open, the inside of the exhaust manifold 22 and the cylinder 11 communicate with each other.

[0028] The exhaust gas collected in the right exhaust manifold 22R is exhausted to the outside via a right supercharger 23R and a right exhaust outlet pipe 24R, which are disposed to the right rear of the engine 100. The exhaust gas collected in the left exhaust manifold 22L is exhausted to the outside via a left supercharger 23L and a left exhaust outlet pipe 24L, which are disposed to the left rear of the engine 100.

[0029] The right supercharger 23R and the left supercharger 23L each have a compressor unit 231 and a turbine unit 232. The compressor unit 231 pressurizes and compresses intake air such as air supplied from outside the engine 100. The pressurized and compressed intake air is supplied to the intake manifold 21 via the intercooler 25. The turbine unit 232 is rotated by exhaust gas supplied from the exhaust manifold 22. The rotational power of the turbine unit 232 is transmitted to the compressor unit 231. That is, the right supercharger 23R and the left supercharger 23L of this embodiment are so-called turbochargers that use an exhaust gas turbine as a drive source.

[0030] The intercooler 25 connected to the intake manifold 21 receives cooling water supplied by a cooling water pump (not shown) and cools the intake air. The intake air supplied from the compressor unit 231 is pressurized and compressed, generating heat of compression and increasing its temperature. The intercooler 25 cools the intake air by exchanging heat between the cooling water supplied from the cooling water pump and the pressurized and compressed intake air. In other words, by providing the intercooler 25, the temperature of the intake air supplied to the intake manifold 21 can be adjusted to a desired temperature.

[0031] As shown in Fig. 4, the right intake manifold 21R and the left intake manifold 21L are arranged at a distance in the left-right direction above the engine 100. As shown in Fig. 4, when the top cover 9 is removed, the in-bank area 200 is exposed to the outside through the space between the right intake manifold 21R and the left intake manifold 21L. In the in-bank area 200, for example, a controller 26 that controls the entire engine 100, a fuel pump 27 that supplies fuel to the injectors 8, and the like are arranged.

[0032] That is, engine 100 includes controller 26 disposed in intra-bank area 200 located between first cylinder row 111R and second cylinder row 111L. Engine 100 also includes fuel pump 27 disposed in intra-bank area 200. Strictly speaking, intra-bank area 200 may also be the spatial area between first cylinder row 111R and second cylinder row 111L. However, in this embodiment, intra-bank area 200 broadly includes the spatial area between right bank RB, which includes first cylinder row 111R, and left bank LB, which includes second cylinder row 111L.

[0033] <2.Fuel system> A fuel system including fuel pump 27 provided in engine 100 will be described in detail. Fig. 5 is a schematic perspective view showing the fuel system FS provided in engine 100. In Fig. 5, fuel stored in a fuel tank (not shown) is supplied to engine 100 from fuel inlet 28. A portion of the fuel is returned from engine 100 to the fuel tank through fuel outlet 29.

[0034] As shown in Fig. 5, the fuel system FS includes the injectors 8 and fuel pump 27 described above, as well as an auxiliary pump 31, a fuel filter 32, a low-pressure fuel pipe 33, a high-pressure fuel pipe 34, and a fuel return pipe 35. As described above, the injectors 8 include six right injectors 8R and six left injectors 8L. The fuel pump 27 is driven by utilizing the rotational power of the crankshaft 6. The auxiliary pump 31 assists in pumping fuel when the engine 100 is started. Specifically, the fuel pump 27 includes a low-pressure fuel pump 271 and a high-pressure fuel pump 272.

[0035] The low-pressure fuel pipe 33 includes a first low-pressure fuel pipe 331, a second low-pressure fuel pipe 332, and a third low-pressure fuel pipe 333. The first low-pressure fuel pipe 331 connects the fuel inlet 28 and the low-pressure fuel pump 271 via the auxiliary pump 31. The second low-pressure fuel pipe 332 connects the low-pressure fuel pump 271 and the fuel filter 32. The third low-pressure fuel pipe 333 connects the fuel filter 32 and the high-pressure fuel pump 272.

[0036] In this embodiment, the fuel filter 32 includes two fuel filters arranged in parallel, but this is an example. The number of fuel filters may be changed as appropriate, and may be one, three, or more. Also, a configuration in which multiple fuel filters are connected in series may be used.

[0037] The high-pressure fuel pipe 34 includes a first high-pressure fuel pipe 341 and a second high-pressure fuel pipe 342. The first high-pressure fuel pipe 341 is a fuel pipe for the right bank RB, and connects the high-pressure fuel pump 272 to multiple (six in this embodiment) right injectors 8R. The second high-pressure fuel pipe 342 is a fuel pipe for the left bank LB, and connects the high-pressure fuel pump 272 to multiple (six in this embodiment) left injectors 8L.

[0038] The fuel return pipe 35 includes a first fuel return pipe 351, a second fuel return pipe 352, and a third fuel return pipe 353. The first fuel return pipe 351 connects the high-pressure fuel pump 272 and the fuel outlet 29. The second fuel return pipe 352 is a fuel pipe for the right bank RB and is connected to each right head block 4R that constitutes the right bank RB. The second fuel return pipe 352 is connected to a junction 351a provided midway along the first fuel return pipe 351. At the junction 351a, the fuel flowing through the second fuel return pipe 352 merges with the fuel flowing through the first fuel return pipe 351. The third fuel return pipe 353 is a fuel pipe for the left bank LB and is connected to each left head block 4L that constitutes the left bank LB. The third fuel return pipe 353 is connected to the junction 351a provided midway along the first fuel return pipe 351. At the junction 351a, the fuel flowing through the third fuel return pipe 353 joins with the fuel flowing through the first fuel return pipe 351.

[0039] Fuel supplied to fuel inlet 28 of engine 100 by a feed pump (not shown) passes through first low-pressure fuel pipe 331 and enters low-pressure fuel pump 271 in response to the operation of low-pressure fuel pump 271. After being pressurized, the fuel is sent to fuel filter 32 through second low-pressure fuel pipe 332. The fuel sent to fuel filter 32 has debris and contaminants removed by fuel filter 32. The fuel from which debris and the like have been removed is sent to high-pressure fuel pump 272 through third low-pressure fuel pipe 333.

[0040] The high-pressure fuel pump 272 receives the fuel, pressurizes the fuel, and discharges it toward the first high-pressure fuel pipe 341 and the second high-pressure fuel pipe 342. The fuel passing through the first high-pressure fuel pipe 341 is distributed to each right injector 8R arranged in the right bank RB. The fuel passing through the second high-pressure fuel pipe 342 is distributed to each left injector 8L arranged in the left bank LB. Each injector 8 injects fuel into the combustion chamber at a predetermined timing. Note that the first high-pressure fuel pipe 341 and the second high-pressure fuel pipe 342 are preferably the same length. This makes it possible to prevent a difference in injection timing between the right injector 8R and the left injector 8L.

[0041] The high-pressure fuel pump 272 returns excess fuel to the fuel tank via the first fuel return pipe 351. Each right head block 4R returns excess fuel that was not used for combustion to the second fuel return pipe 352. Each left head block 4L returns excess fuel that was not used for combustion to the third fuel return pipe 353. The fuel returned to the second fuel return pipe 352 and the third fuel return pipe 353 merges with the fuel in the first fuel return pipe 351 at the junction 351a and is returned to the fuel tank.

[0042] <3. Electrical System> An electrical system including the controller 26 provided in the engine 100 will be described in detail. Fig. 6 is a schematic perspective view illustrating the electrical system ES provided in the engine 100. As shown in Fig. 6, the electrical system ES includes various electric wires 61, such as electric wires that electrically connect the controller 26 to various parts of the engine 100. The parts of the engine 100 electrically connected to the controller 26 include, for example, injectors 8 (see Fig. 5, etc.), relays 62, fuse boxes 63, a communication unit 64 that communicates with the outside, and various sensors 65. The various sensors 65 include, for example, pressure sensors, temperature sensors, and flow rate sensors.

[0043] In this embodiment, the electric wires 61 include power lines, control lines, signal lines, and communication lines. At least some of the electric wires 61 are arranged in the engine 100 as a so-called wire harness, which is a bundle of multiple electric wires. In this specification, the electric wires 61 are used in a broad sense and include electric wires arranged in a wire harness.

[0044] The electric wires 61 include a right injector electric wire 611 including a control line for the right injector 8R arranged in the right bank RB. The electric wires 61 also include a left injector electric wire 612 including a control line for the left injector 8L arranged in the left bank LB. The electric wires 61 also include a communication unit electric wire 613 including a communication line for the communication unit 64. The electric wires 61 also include a sensor electric wire 614 including a signal line for the sensor 65.

[0045] The electric wires 61 that make up the electric system ES include, for example, electric wires that supply power from a battery (not shown) to a starter 66 for starting the engine, and power wires such as electric wires that supply power from an alternator 67 to each part.

[0046] Specifically, the controller 26 includes a first controller 261 and a second controller 262. The first controller 261 and the second controller 262 are aligned in the front-to-rear direction (crankshaft direction). Specifically, the first controller 261 is located forward of the second controller 262. One of the first controller 261 and the second controller 262 is a main controller, and the other is a sub-controller. In this embodiment, the first controller 261 is the main controller, and the second controller 262 is a sub-controller.

[0047] The first controller 261 configured as a main controller executes calculations necessary for controlling the engine 100. The calculations necessary for controlling the engine 100 include, for example, calculations related to control of fuel injection and calculations related to stopping the engine 100. The second controller 262 configured as a sub-controller is connected to the first controller 261 by a communication line (electric wire 61) and is provided so as to be able to communicate with the first controller 261. The second controller 262 performs control operations in accordance with instructions from the first controller 261.

[0048] In this embodiment, the first controller 261 controls the right injector 8R arranged in the right bank RB. That is, the first controller 261 and each right injector 8R are electrically connected by a right injector electric wire 611. The second controller 262 controls the left injector 8L arranged in the left bank LB. That is, the second controller 262 and each left injector 8L are electrically connected by a left injector electric wire 612.

[0049] As shown in FIGS. 4 and 6 , engine 100 includes a guide member 68 along whose surface electric wires 61 are arranged. Guide member 68 is arranged in in-bank area 200. Providing guide member 68 makes it possible to prevent electric wires 61 from bending. Providing guide member 68 also makes it possible to arrange electric wires 61 in an orderly manner. Furthermore, it is possible to prevent emissions from affecting components on the opposite side of electric wires 61 across guide member 68. Furthermore, because guide member 68 is arranged in in-bank area 200, the space inside engine 100 can be effectively used as an arrangement space for electric wires 61.

[0050] Specifically, the guide member 68 is an L-shaped member extending in the front-rear direction. The guide member 68 has a first plate-shaped portion 681 (see also FIG. 7 described later) parallel to the up-down direction and a second plate-shaped portion 682 (see also FIG. 7 described later) parallel to the left-right direction. The electric wires 61 are attached to the guide member 68 by a fastener 69 fixed to the second plate-shaped portion 682 of the guide member 68. Note that the first plate-shaped portion 681 does not have to be completely parallel to the up-down direction and may be tilted at an angle between 0° and 90° relative to the up-down direction. Similarly, the second plate-shaped portion 682 does not have to be completely parallel to the left-right direction and may be tilted at an angle between 0° and 90° relative to the left-right direction. In other words, the first plate-shaped portion and the second plate-shaped portion of the guide member 68 may be L-shaped as long as their function as the guide member 68 is not impaired.

[0051] In this embodiment, the guide member 68 includes a right guide member 68R and a left guide member 68L. The right guide member 68R has a first plate-shaped portion 681 attached to the left side surface of the right intake manifold 21R and is disposed along the right intake manifold 21R (see FIG. 4). The left guide member 68L has a first plate-shaped portion 681 attached to the right side surface of the left intake manifold 21L and is disposed along the left intake manifold 21L (see FIG. 4). The right guide member 68R and the left guide member 68L are disposed at the same height in the up-down direction and spaced apart from each other in the left-right direction.

[0052] In this embodiment, some of the electric wires 61 that make up the electric system ES are arranged in the guide members 68. For example, the electric wires 61 arranged along the right guide member 68R include a part of the right injector electric wire 611 extending from the first controller 261. Furthermore, for example, the electric wires 61 arranged along the left guide member 68L include a part of the left injector electric wire 612 extending from the second controller 262.

[0053] FIG. 7 is a diagram illustrating the arrangement of the electric wires 61 in the guide member 68. Note that FIG. 7 illustrates an example in which the guide member 68 is the right guide member 68R, but the same applies to the left guide member 68L. As shown in FIG. 7, the electric wires 61 may be arranged separately on the upper and lower surfaces of the second plate-shaped portion 682 of the guide member 68. For example, it is preferable that the electric wires 61 that are likely to cause interference due to electromagnetic interference are arranged separately on the upper and lower surfaces. For example, it is preferable that the power lines for supplying power and the signal lines for the sensor 65 are arranged separately on the upper and lower surfaces of the electric wires 61. This can reduce the adverse effects of emissions. Note that the guide member 68 is preferably made of a metal that can block electromagnetic waves.

[0054] FIG. 8 is a schematic cross-sectional view showing the configuration around the controller 26 disposed in the in-bank area 200. As shown in FIG. 8, the controller 26 is disposed at an angle when viewed from the front-to-rear direction. That is, the controller 26 is disposed at an angle when viewed from the crankshaft direction. The controller 26 is disposed at an angle with respect to the up-down direction of the engine 100 when viewed from the crankshaft direction. By disposing the controller 26 in this manner, it is possible to narrow the width in the left-to-right direction and dispose the controller 26 in the in-bank area 200.

[0055] The electric wires 61 arranged along the surface of the guide member 68 include electric wires connected to the controller 26. In this embodiment, the guide member 68 is provided at a position that is higher in the vertical direction than the controller 26. In other words, the controller 26 and the guide member 68 are misaligned in the vertical direction. The guide member 68 may also be provided at a position that is lower in the vertical direction than the controller 26.

[0056] Specifically, the first controller 261 is disposed at an incline that increases upward toward the right. The electric wires 61 extend from the upper portion (upper right end) of the first controller 261 toward the right guide member 68R disposed on the right side of the first controller 261. With this configuration, the length of the electric wires 61 extending from the first controller 261 to the right guide member 68R can be shortened. Also, the bend of the electric wires 61 can be made gentler.

[0057] The second controller 262 is also inclined upward toward the left. The electric wires 61 extend from the upper part (upper left end) of the second controller 262 toward the left guide member 68L arranged on the left side of the second controller 262. With this configuration, the length of the electric wires 61 extending from the second controller 262 to the left guide member 68L can be shortened. Also, the bend of the electric wires 61 can be made gentler.

[0058] As shown in FIG. 8 , a fuel pipe FP is disposed below the controller 26. That is, the engine 100 is provided with a fuel pipe FP disposed below the controller 26 in the intra-bank area 200 and constituting a fuel passage. With this configuration, the intra-bank area 200 can be used efficiently for arranging components, thereby enabling the engine 100 to be made more compact. In this embodiment, the fuel pipe FP is composed of a portion of the first low-pressure fuel pipe 331, a portion of the second low-pressure fuel pipe 332, a portion of the third low-pressure fuel pipe 333, and a portion of the first fuel return pipe 351. However, this is merely an example, and the type and number of fuel pipes FP may be changed as appropriate.

[0059] In this embodiment, a partition wall 91 is disposed between the controller 26 and the fuel pipe FP. In detail, the partition wall 91 is disposed between the controller 26 and the fuel pipe FP in the vertical direction.

[0060] More specifically, the partition wall 91 is a controller mounting base on which the controller 26 is mounted.

[0061] In the intra-bank area 200, two support blocks 92 are arranged on the top surface of the cylinder block 1, spaced apart in the left-right direction. A controller mounting base 91 is supported by the two support blocks 92. More specifically, the controller mounting base 91 is supported by the support blocks 92 via vibration-isolating members 93, such as vibration-isolating combs. The fuel pipe FP passes through a space surrounded by the top surface of the cylinder block 1, the bottom surface of the controller mounting base 91, and the opposing side surfaces of the two support blocks 92.

[0062] 9 is a schematic perspective view showing the configuration of the controller mount 91. The controller mounts 91 to which the first controller 261 and the second controller 262 are attached have the same shape. However, the controller mount 91 is used with its left and right orientation reversed when attaching the first controller 261 and when attaching the second controller 262. FIG. 9 shows the orientation when the second controller 262 is attached.

[0063] 9, the controller mount 91 has a base 911, a first wall 912, a second wall 913, a third wall 914, and a partition wall 915. The base 911 is plate-shaped and extends in a direction perpendicular to the up-down direction. The base 911 is provided with a plurality of base screw insertion holes 911a for fastening the base 911 to a pair of left and right support blocks 92 with screws.

[0064] The first wall portion 912 and the second wall portion 913 have the same shape and are spaced apart in the front-to-rear direction. The first wall portion 912 and the second wall portion 913 are triangular in a plan view from the front-to-rear direction and have inclined portions 912a and 913a. The controller 26 is placed along these inclined portions 912a and 913a, so that the controller 26 is placed in an inclined position. The first wall portion 912 and the second wall portion 913 have bent portions 912b and 913b in their middle portions in the left-to-right direction. Due to the bent portions 912b and 913b, the first wall portion 912 and the second wall portion 913 are V-shaped in a plan view from above. The configuration in which the bent portions 912b and 913b are provided can improve the rigidity of the controller mount base 91.

[0065] The third wall portion 914 connects the higher ends of the first wall portion 912 and the second wall portion 913 in the left-right direction. In the example shown in Fig. 9, the third wall portion 914 connects the left ends. In addition, the partition wall portion 915 connects the bent portions 912b, 913b of the first wall portion 912 and the second wall portion 913. By providing the third wall portion 914 and the partition wall portion 915, the rigidity of the controller mount base 91 can be improved.

[0066] Bosses 916 for screw fastening are provided on both the left and right ends of the first wall portion 912 and the second wall portion 913, and the controller 26 is attached to the controller mounting base 91 using the bosses 916. The controller 26 is preferably attached to the controller mounting base 91 using a vibration-isolating member (not shown) such as vibration-isolating rubber.

[0067] <4. Structure of the area within the bank> 10 is an enlarged view of the area between the controller 26 and the fuel pump 27, which are arranged in the intra-bank area 200. In other words, FIG. 10 is an enlarged view of a part of FIG. 4.

[0068] 10, in a plan view from the top and bottom, the joint portion 94 of the fuel pipe FP is disposed offset from the controller 26. In this embodiment, the joint portion 94 is a portion that joins pipes together, and is a portion where a joint member such as a nut is disposed.

[0069] In this embodiment, the controller 26 and the fuel pipe FP are disposed in the intra-bank area 200, thereby enabling the engine 100 to be made smaller. Furthermore, because the joint portion 94 is offset from and does not overlap the controller 26 in a top-to-bottom plan view, when the fuel pipe FP is disassembled for maintenance or the like, the disassembly work can be performed without removing the controller 26. Furthermore, because the fuel pipe FP is disposed below the controller 26, the controller 26 can be removed without being obstructed by the fuel pipe FP. In other words, according to this embodiment, the engine 100 can be made smaller and maintainability can be improved.

[0070] In this embodiment, a plurality of fuel pipes FP are provided that extend in the same direction. The joints 94 of adjacent fuel pipes FP are offset in the direction in which the fuel pipes FP extend. In this embodiment, the joints 94 of adjacent fuel pipes FP are offset in the crankshaft direction.

[0071] In this embodiment, the fuel pipe FP disposed below the controller 26 extends in the front-rear direction. In other words, the fuel pipe FP extends in the crankshaft direction. Note that in this embodiment, the joints 94 of adjacent fuel pipes FP are offset from each other in the crankshaft direction.

[0072] Specifically, the joint 94 of the first low-pressure fuel pipe 331 is disposed forward of the joint 94 of the second low-pressure fuel pipe 332, which is disposed adjacent to it on the right in a top-bottom plan view. The joint 94 of the second low-pressure fuel pipe 332 is disposed forward of the joint 94 of the third low-pressure fuel pipe 333, which is disposed adjacent to it on the right in a top-bottom plan view. The joint 94 of the third low-pressure fuel pipe 333 is disposed rearward of the joint 94 of the first fuel return pipe 351, which is disposed adjacent to it on the right in a top-bottom plan view. In this embodiment, the joint 94 of the second low-pressure fuel pipe 332 and the joint 94 of the first fuel return pipe 351 are located at the same position in the front-to-back direction, but are not adjacent to each other. Therefore, even if the joint portion 94 of the second low-pressure fuel pipe 332 and the joint portion 94 of the first fuel return pipe 351 are positioned at the same position in the front-to-rear direction, the joint portions 94 are not close to each other, making it difficult to insert tools.

[0073] In this embodiment, the multiple fuel pipes FP are aligned in the left-right direction in a top-bottom plan view. However, the direction in which the fuel pipes FP arranged below the controller 26 extend is not limited to the front-to-rear direction. In a top-to-bottom plan view, the direction in which the fuel pipes extend may be a first direction inclined with respect to the front-to-rear direction, and the multiple fuel pipes may be aligned in a second direction perpendicular to the first direction. In this case, it is preferable that the joints of adjacent fuel pipes are offset from each other in the first direction.

[0074] As shown in FIG. 4, engine 100 is disposed in an area 200 within the bank, and includes a controller 26 and a fuel pump 27 arranged in the crankshaft direction (front-rear direction).

[0075] The fuel pump 27 is connected to the fuel pipe FP via a joint 94. That is, the engine 100 includes the fuel pump 27 connected to the fuel pipe FP via a joint 94.

[0076] More specifically, a pipe extending from the body of fuel pump 27 and fuel pipe FP are connected by joint 94. By positioning joint 94 as close as possible to the body of fuel pump 27, the size of fuel pump 27 that needs to be removed can be reduced, thereby improving workability.

[0077] <5. Things to keep in mind> Various technical features disclosed in this specification can be modified in various ways without departing from the spirit of the technical creation. In other words, the above-described embodiments should be considered to be illustrative in all respects and not restrictive. Furthermore, multiple embodiments and modifications shown in this specification may be combined to the extent possible. [Explanation of symbols]

[0078] 6. Crankshaft 26 Controller 27. Fuel pump 61...Electric wire 68 Guide member 100···Engine 91 Bulkhead, controller mounting base 94···Joint part 111R: Right cylinder row, first cylinder row 111L: Left cylinder row, second cylinder row 200...Inside the bank area 331···First low pressure fuel pipe, fuel pipe 332... Second low pressure fuel pipe, fuel pipe 333···Third low pressure fuel pipe, fuel pipe 351... First fuel return pipe, fuel pipe FP...Fuel pipe

Claims

1. An engine having a first row of cylinders and a second row of cylinders arranged side by side, a controller disposed in an area within the bank located between the first cylinder row and the second cylinder row; a fuel pipe that is disposed below the controller in the bank area and that forms a fuel passage; a right intake manifold provided on the first cylinder row side and connected to the first cylinder row; a left intake manifold provided on the second cylinder row side and connected to the second cylinder row; Equipped with an engine, wherein the fuel pipe overlaps with the controller in a top-bottom plan view, and a joint portion of the fuel pipe is positioned offset from the controller.

2. a plurality of fuel pipes extending in the same direction; The engine according to claim 1 , wherein the joint portions of adjacent fuel pipes are offset in the direction in which the fuel pipes extend.

3. 3. The engine according to claim 2, wherein the fuel pipe extends in the crankshaft direction.

4. The engine according to claim 1 , further comprising a fuel pump arranged in the bank area and aligned with the controller in the crankshaft direction.

5. 5. The engine according to claim 4, wherein the fuel pump is connected to the fuel pipe via the joint portion.

6. The engine according to claim 1 , further comprising a fuel pump disposed in the area within the bank and connected to the fuel pipe via the joint portion.

7. The engine according to claim 1 , further comprising a guide member disposed in the area within the bank, the guide member having an electric wire disposed along a surface thereof.

8. The engine according to claim 1 , wherein the controller is disposed at an angle in a plan view from the crankshaft direction.

9. The engine according to claim 7 , wherein the controller is disposed at an angle in a plan view from the crankshaft direction, and the electric wires include an electric wire connected to the controller.

10. 10. An engine according to any one of claims 1 to 9, wherein a partition is disposed between the controller and the fuel pipe.

11. The engine according to claim 10 , wherein the partition wall is a controller mounting base for mounting the controller.

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